Vacuum cleaner



FIG. 1 is a top, front, and left side perspective view of a vacuum cleaner showing the new design;

FIG. 2 is a front elevation view of the vacuum cleaner;

FIG. 3 is a left side elevation view of the vacuum cleaner;

FIG. 4 is a rear elevation view of the vacuum cleaner;

FIG. 5 is a right side elevation view of the vacuum cleaner; and,

FIG. 6 is a top plan view of the vacuum cleaner.

The details shown in broken lines form no part of the claimed design. 

The ornamental design for a vacuum cleaner, as shown. 